dibujar gráficos en tikz

Question

\documentclass{book}
\usepackage{graphs}
\usetikzlibrary{graphs}

\begin{doument}
\begin{tikzpicture}[new set=import nodes]
\begin{scope}[nodes={set=import nodes}] % make all nodes part of this set
\node [red] (a) at (0,1) {$a$};
\node [red] (b) at (1,1) {$b$};
\node [red] (d) at (2,1) {$d$};
\end{scope}
\graph {
(import nodes);
% "import" the nodes
a -> b -> c -> d -> e;
};
\end{tikzpicture}
\end{document}

Cuando compilé este código, recibí el error.

! LaTeX Error: File `graphs.sty' not found.

Type X to quit or <RETURN> to proceed,
or enter new name. (Default extension: sty)

Enter file name: 

Answer 1

LaTeX sólo puede cargar paquetes existentes. Si intenta cargar uno que no existe, se quejará con un error.

No graphs.styexiste en mi sistema. Creo que el paquete que probablemente quieras es TikZ:

\documentclass{book}
\usepackage{tikz}
\usetikzlibrary{graphs}

\begin{document}
\begin{tikzpicture}[new set=import nodes]
\begin{scope}[nodes={set=import nodes}] % make all nodes part of this set
\node [red] (a) at (0,1) {$a$};
\node [red] (b) at (1,1) {$b$};
\node [red] (d) at (2,1) {$d$};
\end{scope}
\graph {
(import nodes);
% "import" the nodes
a -> b -> c -> d -> e;
};
\end{tikzpicture}
\end{document}